D&D 5E Better monster conversion guides for previous editions to 5e?

[Sword of Spirit]

Back when WotC came out with their conversion guide document, I remember looking at fan made alternatives that had math to show theirs were better. I currently have no idea how to find those again.

Does anyone have any links or lists to such conversion systems?

I'm not so much interested in a tool (unless it also tells me how it functions, then it's great) as I am a step by step list of how to convert an AD&D or 3e monster into a 5e monster.

 

[Quickleaf]

[MENTION=6677017]Sword of Spirit[/MENTION] Here are the resources I'm aware of and have used:

James Bowman's Simple Conversion Guides

Surfarcher's D&D Blog

My own "equating AD&D 2e XP to 5e CR" guideliens